/* ==============================================
   CSS Variables & Base Reset
   ============================================== */

:root {
  --bg-primary:    #0b0b0e;
  --bg-secondary:  #0f0f13;
  --bg-card:       #131318;
  --border:        #1c1c24;
  --border-hover:  #2a2a36;
  --accent:        #f0a030;
  --accent-dim:    rgba(240, 160, 48, 0.1);
  --accent-glow:   rgba(240, 160, 48, 0.18);
  --text-primary:  #edead4;
  --text-secondary:#88889a;
  --text-muted:    #48485c;
  --font-display:  'Syne', sans-serif;
  --font-mono:     'JetBrains Mono', monospace;
  --font-body:     'Outfit', sans-serif;
  --nav-h:         68px;
  --max-w:         1160px;
  --pad-x:         2rem;
  --section-py:    110px;
  --radius:        5px;
  --ease:          cubic-bezier(0.4, 0, 0.2, 1);
  --t:             0.28s;
}

/* Light mode overrides */
body.light {
  --bg-primary:    #f5f4ef;
  --bg-secondary:  #edeae0;
  --bg-card:       #ffffff;
  --border:        #dddad0;
  --border-hover:  #c8c4b8;
  --accent:        #c47d0a;
  --accent-dim:    rgba(196, 125, 10, 0.1);
  --accent-glow:   rgba(196, 125, 10, 0.18);
  --text-primary:  #1a1a1a;
  --text-secondary:#5a5a6a;
  --text-muted:    #9a9aaa;
}

body.light .navbar.scrolled {
  background: rgba(245, 244, 239, 0.9);
}

body.light .mobile-menu {
  background: rgba(245, 244, 239, 0.97);
}

body.light ::-webkit-scrollbar-track { background: var(--bg-primary); }
body.light ::-webkit-scrollbar-thumb { background: var(--border-hover); }

/* Smooth variable transitions on theme change */
body {
  transition:
    background-color 0.35s var(--ease),
    color 0.35s var(--ease);
}

/* Theme toggle button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border-hover);
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition:
    color var(--t),
    border-color var(--t),
    background var(--t),
    transform var(--t);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
  transform: rotate(15deg);
}

/* Show/hide correct icon */
body:not(.light) .icon-sun { display: none; }
body.light        .icon-moon { display: none; }
body.light        .icon-sun  { display: block; }

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }
img { max-width: 100%; display: block; }

code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 1px 5px;
  border-radius: 2px;
}

/* ==============================================
   Utility Classes
   ============================================== */

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  color: var(--accent);
}

.accent-text { color: var(--accent); }

strong {
  font-weight: 500;
  color: var(--text-primary);
}

em {
  font-style: italic;
  color: var(--text-primary);
}

/* ==============================================
   Loading Screen
   ============================================== */

.loader {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s var(--ease), visibility 0.5s var(--ease);
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.loader-mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.loader-bar {
  width: 160px;
  height: 1px;
  background: var(--border);
}

.loader-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  animation: loadBar 0.7s var(--ease) forwards;
}

@keyframes loadBar {
  to { width: 100%; }
}

/* ==============================================
   Navbar
   ============================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 200;
  border-bottom: 1px solid transparent;
  transition:
    background var(--t) var(--ease),
    border-color var(--t) var(--ease);
}

.navbar.scrolled {
  background: rgba(11, 11, 14, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: var(--border);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

/* Logo */
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 2px;
  transition: opacity var(--t);
}

.nav-logo:hover { opacity: 0.75; }

.logo-bracket { color: var(--accent); }
.logo-text    { color: var(--text-primary); margin: 0 3px; }

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2.2rem;
  margin-left: auto;
  margin-right: 2rem;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.07em;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--t);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s var(--ease);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

/* Resume button */
.nav-resume-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.07em;
  color: var(--accent);
  border: 1px solid rgba(240,160,48,0.4);
  padding: 7px 15px;
  border-radius: var(--radius);
  white-space: nowrap;
  transition: background var(--t), color var(--t), border-color var(--t);
}

.nav-resume-btn:hover {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
  width: 32px;
  height: 32px;
}

.nav-hamburger span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--text-primary);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
  transform-origin: center;
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 199;
  background: rgba(11, 11, 14, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  padding: 2rem var(--pad-x);
  transform: translateY(-110%);
  transition: transform 0.38s var(--ease);
}

.mobile-menu.open { transform: translateY(0); }

.mobile-menu ul {
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
}

.mobile-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.07em;
  color: var(--text-secondary);
  transition: color var(--t);
}

.mobile-link:hover { color: var(--accent); }

/* ==============================================
   Section Layout
   ============================================== */

.section {
  padding: var(--section-py) 0;
}

.section-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.section-header {
  margin-bottom: 4rem;
}

.section-tag {
  display: block;
  margin-bottom: 0.85rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

/* ==============================================
   Animations
   ============================================== */

/* Hero reveal (play on load after loader hides) */
.reveal-up {
  opacity: 0;
  transform: translateY(28px);
  animation: revealUp 0.65s var(--ease) forwards;
  animation-delay: var(--delay, 0s);
  animation-play-state: paused;
}

.reveal-up.playing {
  animation-play-state: running;
}

@keyframes revealUp {
  to { opacity: 1; transform: translateY(0); }
}

/* Scroll fade-in */
.fade-in {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==============================================
   Hero Section
   ============================================== */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: calc(var(--nav-h) + 4rem);
  padding-bottom: 5rem;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
}

/* Two-column row: text | photo */
.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
  width: 100%;
}

.hero-content {
  flex: 1;
  min-width: 0;
}

.hero-greeting {
  margin-bottom: 1.75rem;
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(3.8rem, 9vw, 7.8rem);
  font-weight: 800;
  line-height: 0.93;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1.75rem;
}

.name-line { display: block; }

.name-dim {
  color: var(--text-muted);
  transition: color 0.4s;
}

.name-dim:hover { color: var(--accent); }

.hero-subtitle {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: clamp(0.85rem, 1.8vw, 1rem);
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

.typing-text { color: var(--accent); }

.cursor {
  color: var(--accent);
  animation: blink 1.05s step-end infinite;
  font-weight: 300;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.hero-value {
  font-size: clamp(1rem, 2vw, 1.18rem);
  color: var(--text-secondary);
  max-width: 500px;
  margin-bottom: 3rem;
  line-height: 1.65;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Hero photo — right column */
.hero-photo-wrap {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-photo-ring {
  position: relative;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  padding: 4px;
  /* Amber gradient ring */
  background: conic-gradient(
    from 0deg,
    var(--accent) 0%,
    rgba(240,160,48,0.15) 40%,
    var(--accent) 70%,
    rgba(240,160,48,0.15) 100%
  );
  animation: ringRotate 8s linear infinite;
  box-shadow: 0 0 40px var(--accent-glow), 0 20px 60px rgba(0,0,0,0.5);
}

@keyframes ringRotate {
  to { transform: rotate(360deg); }
}

.hero-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  display: block;
  /* Counter-rotate so photo stays upright while ring spins */
  animation: ringRotateReverse 8s linear infinite;
  border: 4px solid var(--bg-primary);
  transition: transform 0.4s var(--ease);
}

@keyframes ringRotateReverse {
  to { transform: rotate(-360deg); }
}

.hero-photo-ring:hover .hero-photo {
  animation-play-state: paused;
  transform: scale(1.04);
}

.hero-photo-ring:hover {
  animation-play-state: paused;
  box-shadow: 0 0 60px var(--accent-glow), 0 24px 70px rgba(0,0,0,0.55);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.77rem;
  letter-spacing: 0.07em;
  padding: 12px 26px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform var(--t) var(--ease),
              box-shadow var(--t) var(--ease),
              background var(--t),
              color var(--t),
              border-color var(--t);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 500;
}

.btn-primary:hover {
  background: #ffb84d;
  transform: translateY(-3px);
  box-shadow: 0 10px 28px var(--accent-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-hover);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
}

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 3rem;
  left: var(--pad-x);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  opacity: 0.45;
}

.scroll-line {
  width: 1px;
  height: 56px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollAnim 2.2s ease infinite;
  transform-origin: top;
}

@keyframes scrollAnim {
  0%   { transform: scaleY(0); opacity: 1; transform-origin: top; }
  50%  { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(0); opacity: 0; transform-origin: bottom; }
}

/* ==============================================
   About Section
   ============================================== */

.about-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 5rem;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.82;
  margin-bottom: 1.35rem;
}

.about-text p:last-child { margin-bottom: 0; }

/* Stats */
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

/* About avatar */
.about-avatar-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 1.5rem;
  grid-column: 1 / -1;
}

.about-avatar {
  width: 185px;
  height: 185px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  box-shadow: 0 0 0 4px var(--accent-dim), 0 8px 28px rgba(0,0,0,0.45);
  transition: box-shadow var(--t) var(--ease), border-color var(--t) var(--ease), transform var(--t) var(--ease);
  display: block;
}

.about-avatar:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 7px var(--accent-dim), 0 12px 36px rgba(0,0,0,0.5);
  transform: scale(1.04);
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color var(--t);
}

.stat-card:hover { border-color: var(--border-hover); }

.stat-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==============================================
   Skills Section
   ============================================== */

.skills-section {
  background: var(--bg-primary);
}

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem 5rem;
}

.skill-category {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.skill-cat-label {
  display: block;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-weight: 400;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: var(--radius);
  cursor: default;
  transition: color var(--t), border-color var(--t), background var(--t);
}

.skill-tag:hover {
  color: var(--accent);
  border-color: rgba(240,160,48,0.35);
  background: var(--accent-dim);
}

/* ==============================================
   Projects Section
   ============================================== */

.projects-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  overflow: hidden;
  transition:
    border-color var(--t) var(--ease),
    transform var(--t) var(--ease),
    box-shadow var(--t) var(--ease);
}

/* Animated top border line on hover */
.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.38s var(--ease);
}

.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: 0 20px 44px rgba(0,0,0,0.38);
}

.project-card:hover::before { transform: scaleX(1); }

/* Card elements */
.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.card-icon {
  color: var(--accent);
  opacity: 0.65;
  flex-shrink: 0;
}

.card-links {
  display: flex;
  gap: 0.7rem;
  align-items: center;
}

.card-link {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  transition: color var(--t), transform var(--t);
}

.card-link:hover       { color: var(--text-primary); transform: scale(1.1); }
.card-link-ext:hover   { color: var(--accent); }

.card-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.card-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.72;
  flex: 1;
}

.card-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
}

.stack-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 9px;
  border-radius: 3px;
  border: 1px solid rgba(240,160,48,0.18);
}

/* ==============================================
   Experience Section
   ============================================== */

.experience-section {
  background: var(--bg-primary);
}

.experience-list {
  display: flex;
  flex-direction: column;
  padding-left: 1.25rem;
  border-left: 1px solid var(--border);
  gap: 0;
}

.exp-item {
  position: relative;
  padding-left: 2.5rem;
  padding-bottom: 3rem;
}

.exp-item:last-child { padding-bottom: 0; }

.exp-dot {
  position: absolute;
  left: calc(-4.5px);
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 0 1px var(--accent);
  transition: box-shadow 0.3s;
}

.exp-item:hover .exp-dot {
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.exp-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--t);
}

.exp-card:hover { border-color: var(--border-hover); }

.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.exp-role {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.exp-company {
  font-size: 0.88rem;
  font-weight: 400;
}

.exp-period {
  font-size: 0.68rem;
  color: var(--text-muted);
  white-space: nowrap;
  margin-top: 4px;
}

.exp-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.77;
  margin-bottom: 1.25rem;
}

.exp-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* ==============================================
   Open Source Section
   ============================================== */

.oss-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.oss-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 2rem;
  align-items: start;
}

/* Featured contribution card */
.oss-featured {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  transition: border-color var(--t);
}

.oss-featured:hover { border-color: var(--border-hover); }

.oss-project-header {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.oss-project-icon {
  width: 50px;
  height: 50px;
  border-radius: 10px;
  background: var(--accent-dim);
  border: 1px solid rgba(240,160,48,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.oss-project-meta { flex: 1; }

.oss-project-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.oss-project-org {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  margin-top: 3px;
}

.oss-ext-link {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: color var(--t), border-color var(--t), background var(--t);
}

.oss-ext-link:hover {
  color: var(--accent);
  border-color: rgba(240,160,48,0.35);
  background: var(--accent-dim);
}

.oss-summary {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.75;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

/* Contribution bullet list */
.oss-contributions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.oss-contrib-item {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
}

.oss-contrib-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  margin-top: 8px;
}

.oss-contrib-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.72;
}

.oss-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.oss-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.oss-period { color: var(--text-muted); font-size: 0.67rem; }

/* Stats panel */
.oss-stats-panel {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.oss-stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: border-color var(--t);
}

.oss-stat:hover { border-color: var(--border-hover); }

.oss-stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
}

.oss-stat-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.oss-callout {
  background: var(--accent-dim);
  border: 1px solid rgba(240,160,48,0.2);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
}

.oss-callout svg {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.oss-callout p {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==============================================
   Certificates Section
   ============================================== */

.certs-section {
  background: var(--bg-primary);
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}

.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  position: relative;
  overflow: hidden;
  transition:
    border-color var(--t) var(--ease),
    transform var(--t) var(--ease),
    box-shadow var(--t) var(--ease);
}

/* Accent left bar */
.cert-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.35s var(--ease);
}

.cert-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.32);
}

.cert-card:hover::before {
  transform: scaleY(1);
}

/* Badge icon */
.cert-badge {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: var(--accent-dim);
  border: 1px solid rgba(240,160,48,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
  transition: background var(--t), border-color var(--t);
}

.cert-card:hover .cert-badge {
  background: rgba(240,160,48,0.18);
  border-color: rgba(240,160,48,0.4);
}

.cert-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.cert-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.cert-issuer {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.cert-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.cert-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.cert-date {
  color: var(--text-muted);
  font-size: 0.67rem;
}

.cert-badge-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 9px;
  border-radius: 3px;
  border: 1px solid rgba(240,160,48,0.18);
}

/* ==============================================
   Contact Section
   ============================================== */

.contact-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.contact-inner {
  max-width: 620px;
}

.contact-title { margin: 1rem 0 1.5rem; }

.contact-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 2.5rem;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: var(--accent);
  margin-bottom: 3rem;
  position: relative;
}

.contact-email::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.contact-email:hover::after { transform: scaleX(1); }

.contact-email svg {
  transition: transform 0.25s var(--ease);
}

.contact-email:hover svg { transform: translateX(4px); }

.contact-socials {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  transition: color var(--t), transform var(--t);
}

.social-link:hover {
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ==============================================
   Footer
   ============================================== */

.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer .mono-label { color: var(--text-muted); font-size: 0.68rem; }

/* ==============================================
   Responsive Breakpoints
   ============================================== */

@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero-photo-ring {
    width: 240px;
    height: 240px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-py: 80px;
  }

  .nav-links,
  .nav-resume-btn {
    display: none;
  }

  .nav-hamburger { display: flex; }

  /* Stack hero vertically on tablet/mobile */
  .hero-inner {
    flex-direction: column-reverse;
    align-items: center;
    gap: 2.5rem;
    text-align: center;
  }

  .hero-content {
    width: 100%;
  }

  .hero-photo-ring {
    width: 200px;
    height: 200px;
  }

  .hero-subtitle,
  .hero-cta {
    justify-content: center;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .certs-grid {
    grid-template-columns: 1fr;
  }

  .oss-layout {
    grid-template-columns: 1fr;
  }

  .oss-stats-panel {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .oss-callout {
    grid-column: 1 / -1;
  }

  .skills-grid {
    grid-template-columns: 1fr;
    gap: 2.25rem;
  }

  .hero-name {
    font-size: clamp(3.2rem, 14vw, 5rem);
  }

  .hero-scroll { display: none; }

  .about-stats {
    grid-template-columns: 1fr 1fr;
  }

  .exp-header {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  :root {
    --pad-x: 1.25rem;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }

  .hero-photo-ring {
    width: 170px;
    height: 170px;
  }

  .hero-cta {
    flex-direction: column;
    gap: 0.75rem;
  }

  .btn { width: 100%; justify-content: center; }

  .contact-socials {
    flex-direction: column;
    gap: 1.25rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ==============================================
   Selection Color
   ============================================== */

::selection {
  background: var(--accent-dim);
  color: var(--accent);
}

/* ==============================================
   Scrollbar (WebKit)
   ============================================== */

::-webkit-scrollbar       { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }